Intake manifold for internal-combustion engines



BEST AVAILABLE COP\ Aug. 31 1926. 1,598,046 H. L. BROWNBACK INTAKE MANIFOLD FOR INTERNAL COMBUSTION ENGINES File pril 8,. 1924 2 Sheets-Sheet 1 BEST AVAXLABLE cop Aug. 31 1926.

14. L. EHQCDVVPJEMA :K

INTAKE MANIFOLD FOR INTERNAL COMBUSTION ENGINES Filed April 1924 2 Sheets-Sheet 2 lllllu Ill lll|l l Xllllllllllll sage.

A still further object is to provide a valve- Patented Aug. 31, 1926.

unite stares g ZESTAVALLABLEGQE:

P a-TENT .o Fries HENRY LOWE nnowmaack, or noim'rs'ro'wn', PENNSYLVAN LAi INTAKE MANIFOLD FOR INT ERNAL-COMBUSTION ENGINES.

Application fi1ed.Apri1 s, 1924. Serial No. 705,025.

This invention is a novel intake manifold for internal combustion engines having a single intake valve and exhaust valve for each cylinder or working chamber, and the principal object of the invention is to provide a novel intake manifold, having two fuel ducts supplied by separate carburetors, said ducts being so shaped and proportioned as to give maximum eflicient' gas speeds for allengine speeds, and a plurality of separate and distinct efiiciency ranges and peaks as the speed of :the engine increases from: zero to maximum. a v r Another object of the invention is to pro- T vide a novel intake-manifold, having a duct for the fuel gases passing intothe working.

cylinder at high engine speeds, and a sepa rate duct for the fuel gases atlow engine speeds, said ducts being supplied by separate carburetors; also a duct therein for the exhaust gases disposed adjacent the low speed gas duct and adapted to heat same and the gases therein and thus prevent cone densation of the gases in the low speed pasin the high speed fuel gas 'duct disposed adjacent the intake ports of the engine said valve serving also as the throttle for the high speed carburetor so that when the engine is aspirating through the low speed fuel passage, the gases in thehigh speed fuel passage will be prevented from becoming rarified, and also to prevent pulsation 1 due to fuel gases being forced back through the said valve in the high speed duct and compressing the column of gas in the high speed duct. I

Other minor objects of the invention will be hereinafter set forth.

I will explain the invention with reference to the accompanying drawings which illustrate one practical embodiment thereof to enable ethers to adopt and use the same, and

will summarize in the claims, the novel features of construction, and novel combinations of parts, for which protection is desired.

In the drawings:

Fig. 1 is a side elevation of a conventional a-oylinder internal combustion engine equipped with my novel-manifold.

Fig. 2 is a section therethrough on the line 2-2, Fig. 1.

Fig. 3 is an enlarged vertical longitudinal section through the manifold, detached.

: -;Fig..4-;is an enlarged horizontallongitu div ;nal ,section'through the manifold.

i :Fig.,5 is atransverse section :on. the 11118 Fig. 6 is a transverse section on the line ,As shown -iin :nFigs. '1 and 2," the.engine shownin the'drawings is show-mas aconven ;t10nal 4-Cyl1l1d6I' internalv combustion engine,

having; four cylinders O, disposed in the engine casting each 'cylinderbeing provided.

with [an intake valve I, .with apassage I, "leading to the ,BXtQIIOIMOf-thQ engine .cas-i,

also an exhaust valvegE is. provided, -for each; cylinder, with ports vle'rrdirrgtt the exhaust pipe Basshowniin Rigsql andi However. any. type. 0t: internal rcombustioni. I

engine may be used,- and the: number of cyl- .inders or units is not material'to vthe-invention and may bevaried at WilL In the drawings,themanifoldgcornprises. I a cylindricalbody portion- 1,.of substantially 3 vthe same length asthe engine. casing upon;

which the manifold-is to be used, saidbody 1 portion 1 being closed at each end preferably by detachable. end plates 1?, .which'maybe bolted, or securediinanyother desired.

.manneryto the body portion. The bore 1 of the body portion 1 is preferably cylindri' cal, and extendsthe full lengthof said body portion.

- Communicating with bore l is tubular inlet extension 19,;depending from the body portion 1, preferably adjacent its mid-point,

v the lower end oflextension. .1..being preferably flanged as at 1 and provided with bolt holes invthe usual manner, forthe re-, ception of'bolts for attaching the main carburetor C thereto.- V y 4 From the rear. of body! portion 1 extend a plurality of tubular-feeder extensions 1,

- communicating. withibore l four sucl1 ex-- tensions being shown) and adapted to reg-- lster respectively with the intake ducts I in 4 1 at permanent-seine meters- 1 aad the As Shea/n ght w e BEST AVAlLABLE COP\ cal duet 3 of relatively small diameter, and disposed openings or holes 6 adapted to aladapted forthegp'assage"'of the ilow zspeed low the iuel vaporswfroni the main'earfuel vapors "threthi'oiigh"wheh this -engine -blfretor G to pass-'irito the 'interior of the is running at low speeds, said bore 3 being---tube-6-or-any position of tube 6 with respect dispose-d P hlyva -the atewa s ieermt a ate 4 4 s ner of housing 3. The remaining portion of each of the feeder extensions I is a port or housing 3 forms a .cluet 39fada ptedTiOrf EhQLOPBDi g 0 "=th puizpose'oztp lm t g passage therethrough of the exhaust gases vapors to pass from the interior of tube 6 flroni the cylinders or working E'lfam'beis'mf said-feeder extensions 1 and hence into t 1e engine Y Duct-3 batman-ates eitl'i 'the i ilteriior lated -i'iitaashe propeWmg-istering "position; of each feeder eXtehs'iorFF'by rheans' zifgpa'ga'll "the openirigs o 'ibeing"aiigned 'aiid' reg sages "3 higft) *eitiiding up'i't ariilly l isteriri' simhltafiebusly with the' feetil er ax rearwardly throughthe Walls of extensiofis tensi I i E outer ends of said feeder extensions -i;." roxittratel y only dne-fourthas'largein di- At one end 0'1": tore 3" is alw ubulafi inle't ametewas'the m'ain' fuehgas bore 1 the duct eXte-nsibii 3"" coninii nieatingwithsaid i bore being a iaptedatb supply fuel gas 'to the so, ,.-ii the tube fi p pposite the intake ports I when the tube 6 is oseiland depefidirig fiiiih'the hoiIsiii g'liii iiiidkir-Working chambersaO independentlyof the-' WOifking cylindersO when the engine'is run extensiono' fth e duht ii ta's shown iIi'FigPD' tOfthe work'irfgicliambers;

atthe end of the mai'nfdldoppbsit thefifiht -'The ina'iIi carburetor C preferably has 11;

extensibiii 13. At the other ei'i'd "of" exhaust f throttle located at the carburetor,- the tube or duct 3 is a' tubular outlet xtnsion smom sleeve GSerViIig asthe thi ottle forfsaid main municatinfgg' -iwi'th' said duct, I aiid 'dependir'ig earbuieton'=but=the auiiiliarycarburetor(y'is frorn the *housin'g ,3, adjacent the enemies *pro'vided. with the' asu'ar throttle locatedat p f the said carburetor, as shown in Fig. 1, The eiiliaust'ga seypass through duct- 325 which 'throttle 'may'ibe controlledby the and out through; tubularoutletextension '-3 ;h1sual link-L; or"oth'eri Ihe'chanism, for"opfrom 'whenee the exhau's'figass may 'be "con-' eratirig the said thiottle' of carburetor "1- duoted, in'to'a suitable mufiirymm shown) slidably' mb'raciirgthe' linkniechanism L- or'disehargetl'intothe'atriiosphere. The X f is "a member lf adapted to rotate or oscilhaust gases in duct 3 heat the walls of gas late the ti1be'-dr 'sleeve' fi' in the bore 1, to duct 3 f' a nd the fuel gasjjthe'rein;and prvent bringthepoi'ts 6 therein into register-with condensation of the fuel'ga'ses in'duet3;aiidfthe' feeders 1; 'at a predetermined engine the travel'of the eizhaust'gases'iifduet3'-is in speed or after the' throttle of the auxiliary a direction opposite to gases "in duct 3';

Around theoutleteiitnsion's'is proiq'ided en i an air heater- 5 of anyflesired or*suit-ab'le"'buretor C has been attained. Any desired type, having a passage or pipe 5 "le'adir1'g"rneans"may be 'pr'ovide'd for so operating the theretromto tlie'air'inlet p'ort'ofth'e'aiixili" sleeve 6, and as shown infFigs; land 2, ary carburetor C io'r th'e purpose of supply link If' is rigidly connected to"a"verticall'y ing hea'ted' 'a'ir'to said auxiliary carburetor I (Fig. 'Q g I mountedofi"the'en'gine"casi11g, 's ai'd shaft lvith iri the bore 1 is a fotarywalve-or "having a bevel gear thelreonnneshing with sleeveboiiiprfiiiiga t'ub'e' 6.'1naki;ng a""elo s"e abevelgear on'the'"sleevejshaft 6 2' A spring fit in the bore 1*, and extendingfthe fhli around'theVert-ically'disposedshafttendsto lengtli thereoiflsa'id tube 6Lbeing c'losed*"a't' keep the sleeveinmormallyclosed position. each end asiat 6 Attached to one 'end of "On the link L are stops on'both sides of the travel 'of the fuel ca i'buretor"*'G -has been f opened to its full I eXtent 'and-the maxirhum 'efficiencyof theel oip erating through'said auxiliary car'- disposed shaft 'housed 'in' suitable-brackets" the tube 6 is shaft 6 'extending'through "link L; and the above inentione d spring the'adjaoentfend lplate'l 'of theibodyLQ'said"tendsto keep the link L into engagement shaft 6"? hauingfsiii tabl'" mea s c'onn'eeted jVit-li the outermost"st'op. "iVhen however thereto .for eiuaung the sle'eveb Within link L' is moved toop'en the auxiliary car the bore 1} as hereinaftef'deseribedl"i"f buretor throttle the inner stop wil'l'engage' sion 1""is a plurality of eircil'rnferentially'iiier stop Ina'y behdj usted'sb that the sleeve-" 6 will r'not 'be rotated until the throttle has been opened its full extent.

In operation, when the engine is running idle, or is throttled to very low speeds,'the ports 6 in the tube 6 will notv register with the feeders 1 since the link L is not engaged with the inner stop on link L. A small amount offuel vapors will be supplied by the auxiliary carburetor C through the duct 3*, which duct 3 and the gases or fuel vapors-therein are kept heated by means of the exhaust gases which are vpassed through the duct 3 in the opposite direction to'the travel of the gas in duct 3 also by means of the stove 6 which'supplies heated air to the auxiliary carburetor C. The small diameter of duct 3": allows a high gas speed to be maintained in duct 3" at low engine speeds, thereby eliminating condensation, poor distribution-and other undesirable features attendant with low gas speeds in manifolds of large-diameter.

Aszthe link L is'operated to open the throttle of auxiliary' carburetor C to its full extent, or when; the engine is operat ing with maximum efficiency and speed through said carburetor C and duct 3', further operation of the link L will cause the inner stop to engage link L and rock the tube 6 in the bore 1 to bring the ports 6 therein into register with the feeders 1 whereby, gas from the main carburetor-G will be supplied to the said feeders 1, from the main carburetor G, in addition to the supply of fuel gases from the auxiliary carburetor C. Upon further opera tion ofthe link L the tube 6 will be ro-' tated until the maximum opening between the ports G and feeders l is obtained.

By the above arrangement, the maximum efiicient gas speeds at or for all engine speeds is obtained and two separate and close to the feeders I or intake valves. This is an important-point in the eflicient operation of the engine, for if the throttle for the main carburetor were located at a point close to the carburetor, every time the engine was aspirating through the low speed duct 3 and low speed or auxiliary carburetor C said operation would tend to rarity the column of gases in the high speed bore 1 and 1 and cause lagging thereof owing to the inlet valve turning for high BEST AVAILABLE COP\ turb the distribution of the low speed gas,

and make the engine surge. But by locating the-throttle close to the feeds or intake ports 1 this-surging or'wpulsation is entirely eliminated; However, as for the lowspeedor auxiliary carburetor C, the throttle therefore would belocated close to the carburetor. where-a better control for low speed gases is-obtained.

My novel manifold will give maximum etlicient-gas speeds at and for all engine speeds,-and-will give two separate anddistinct efficiency ranges and peaks. -v

1. For an engine of, the character specified, an intake manifold having an, inlet adapted :to ;be connected 5 to; a main carburegister with the, engine I intake valve vport a valve-in said-manifold;; an exhaustduct in said manifold for the'passa'ge itherethrough of the engine exhaust gases and having. an inlet and an (outlet;- a -fuel duct -heated by the exhaust-duct;- said'ifuel' duct-adapted to be connected to van auxiliary carburetor;

a PaSSELgQtCOHHGCtlIIgihG fuel duct with the feeder -;and; {means ,whereby, the valve, will be operated-to-connect the :main carburetor with the feede'r at-Ja predetermined opening of the auxiliarycarburetorwalves 2. For anengine of-- the character; specified, an intake IIlMlifOlCl-hfiViIlg an inlet adapted'to loc -connected to'a main carburetor; a feeder communicating with said manifold and adapted to register with the en ine-intake valve port; a valve in said manifold; an exhaust duct extending longitudinally 'of said manifold and adapted for the passage therethrough of. the engine exhaust gases and-having an. inlet and an outlet; a fuel duct within the exhaust duct and having an inlet adapted-to :be connected with an auxiliary carburetor; a passage connecting said fuel duct} with the feeder; means -for-heating ,the air passing into the auxiliary carburetor; and means whereby the valve may be, operated to connect the main carburetor to the feeder at a predetermined opening of the auxiliary carburetor valve.-

.retor; a-.1feederon-1saijd manifoldiadapted to too 3. In ainanifold as set forth in claim 2,

said exhaust duct outlet being adjacent the fuel duct, inlet; and said means ,for heating the airpassinginto the auxiliary carburetor, comprising a heater around the exhaust duct outlet, and a pipe leading from said heater into the air intake port of the auxiliary carburetor.

4:. For an engine of the character specified; a manifold comprising a tubular body portion havinganainlet aldaptedi to be connected with a niain canburetorya feeder communieating :with the saidbody pontionvand adapted toregi'sternvith thereng'i-ne intakeport; a sleeve rotatahly nfonnted iwithinsaid body portiongiand having circnniferentially disposedslots therein 0 ppositeu said inlet, and.

having I a slot therein opposite' said feeder an exhaust duct-exterior tonand-extending longitudinally iof 'said body portionv and adapted for the passingtherethrough of; the engine exhaust -gases an auxiliary @fuel' duct within-:said exhaust 1duct; 9said fuel duct being adapted to be connected with a X1-fl,11X'

iliary earbureton; a passage: connecting said auxiliary-g fuel duct with the feeder; "and ineans whereby the f sleeve may be rotated to connect the-"main oarbureter' with the feeder at a predetermined opening ofnthe' auxiliary}carburetor valve. 1

haracter $513661- 5. For an en'gineof the i adapted itoiregis ter respectively; with the -in- BEST AVAILABLE COP\ take valve ports of saidtengineyan.exhaust. 5--

duct extending:longitud 'nallynof said bod pertion rand-adapted fen the passageithere-.

:t-hrouglh ofrt-he: engine exhaust; gases ;j a fuel duct heated; by the ;en'haust duct and; h-av- 1 ifrom "said ifllel duct -tiiu'alyi. \n v into athei feeders. respec- 8. Foru-an iengi-neo-ofuthe character specimain carburetor;axplurality of feeders coniduatextending!longitudinally of said. body through ofl the i enginewexhaiist gases g1 'a-zfuel .duc-t heated byi :theeexhausti duct, and hai ingan inletiadaptedrtonbeuattached to an 1 auxiliary :carburetor'; Panda passages leading v '70 'fied aiimanifoldvcomprising:a"body portion I havin'gi an ZlIllBtadaptedjzto gbe attached, .to' a '1 municating twang then:bodyfi-t portionzrand I adapted to' registe'r respectively with the in-: takevalvevportsipfli'said; engine an exhaust portion andf adaptedgfer' the passage therew fled, alrintakeunanifoldcomprising-a tubuing' an inlet adapted to-besattachediito anlar body portion elesed at its ends and hav ing aiii' inlet' adapted to vbeszconnected :to': a

main ea-i buretor; feeder-connecting said 1 body 'poition with the: engine intake port a sleeve rotatably mounted withinsaidbody portion, said sleeve being closed 'at 400th ends and having eineumferentially disposed slots therein opposite' said inlet, and a port 0pposite said feeder; an exhaust; duct' extending lon itudinall'y of' said body'portion, and

be rotated-t0 connect the main carbure-' tor with the' feeder after "a predetermined opening ofthe auxiliary =carburet0r valve.

'6. In a manifold as'set forth in claim 5, said exhaust-duct outlet being adj acent-the fuel duet inlet {and said means for heating the air-passing into the'auxihary'carbure tor, comprising a heater around theexhaust duct outlet,*and a pipe leading from sai'd heater into the air intake port ofthe auxiliary barburetorx- '7. For an engine of the character-'speci fled, a-manifold comprising a-body portion having an inlet adapted tobe attached to a main' carburetor a plurality of l feeders communicating-with the body portion and auxiliary oanburetongzpassages leading. from .%said fuel duct intothe i feeders respectively 2 and aivalve in saidr bodjfi portionuadapted zto" bei operatedfitokfloonneot the :Inai-n' carbunretor to theilfeeders at ia predeterminediopening ofithe auxiliary iearburetoni valve; *1

9. For anzenginelof theycharacter speci- 1- fled, e ma'ni-fold comprising arbody portion i-having an inlet i adapted tor-be attached toa main carburetor; a'vplurality ofrfeeders comniunioatingi' with the body- 'portion and :adapted tofiregister' respectively with the intake valve ports' of: said enginenan exhaust. I

.duct ext-ending -longitudi1iallyJof said body portion and adapted for tlie passage'therethrough offl the engine: exhaust gases,v said exhaust duothavin'g an outlet; a fuelduct I heated by the enhaustwduct and having an inlet adapted to be attached to an auxiliary carburetor; passages'leading from-said fuel duct into the feeders respectively; a valve' i in said body portiony'and means-whereby the valve may be ioperated to'connect:the

main :cafburettir with the feeders'at 'a preretor valves: f v

' determined opening of theauxiliary: carbuset forth in claim 9-, said exhaust-duct outlet being adj aeent the fuel duct inlet i and means-for heating the air passing into the auxiliary: carburetor comprising a heater around' theexhaustduct-outlet, and a connectiombkatweenrthe heater and theair intake port of the-auxiliary carburetor.

In te'stiniony that 'I=- claim' the foregoing as my own, I- afiix mysi'gnature:

' HENRY LQWE 'BROW-NBAGK."

10. In combinationvwith :a' manifold as 

